Core for use in molding concrete pipe in situ



J. W. CQLVIN CORE FOR USE IN MOLDING CONCRETE PIPE IN SITU Aug. 5, 19524 Sheets-Sheet 1 Filed'.Jan. 31, 1949 John W. C/v/'n' 1N VEN TOR.

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Aug. 5, 1952 J. wfcoLvlN CORE FOR USE IN HOLDING CONCRETE PIPE 1N SITU 4Sheets-Sheet 2 Filed Jan. 51, 1949 John W. Colvin INVEN TOR.

.BY aaa/Wawy HMI-mm Aug. 5, 1952 J, w, coLvlN 2,605,534

CORE FOR USE IN MOLDING CONCRETE PIPE IN SITU Filed Jan. 51, 1949 4Sheets-Sheet 5 Fig. 8.

Jahn W. Colvin INVENTOR.

Y #Wwf/mm@ J. w. coLvlN 2,605,534

4 Sheets-Sheet 4 Jahn W. Galvin QS QQ SS INVENTOR.

CORE FOR USE IN MOLDING CONCRETE PIPE IN SITU Aug. 5, 1952 Filed Jan.31, 1949 Patented Aug. 5, 1952 i iIPE 1N sIfrU fv Glendale,

Thisit'invention relates to Ynew and useful im provements and structuralrenements in? ma# chinery for pouring and forming concrete pipes,

and -thepr-incipal object of the invention is to.

facilitate the perfomance of the pipe .pouring operation-With expedienceandwithsthe expenditure of Aa minimum amount of labor.

In -particular, the inst-ant invention pertains to,

improvements inthe apparatusrwhich constitutes the subject matter of myUnited States Patent No. 2,306,037, granted on yDecember221.1942;l

While experimenting with the .apparatus l con-` structed in -accordancewith the teachingsrlof this prior patent, I found that-thevmachinerylends itself to certain-structuralv and utilitarian ini-.fy

provements, and it/is,therefore,` anotherffeature of the instantinvention tof provide apparatus in which such improvementsare-embodiedf1 In-effect, the apparatus herein involved consists otmeansforvforming and `finishing thepipe poured'inthe ditch. j'. i f'i v Theinstant invention contemplates the 1 provision of the apparatus yasabove 'outlined which is simple infconstruction, which may beconveniently and Vvexpeditiously manipulatecLgand which will `readilylend itself to Y'econoniicali manufacture.-

With the above more important objects and features in view, and such'other objects and fea tures'as maybecome apparentv as thisspecification proceeds, the invention consists essentially of thearrangement and construction of parts as illustrated in the:accompanying drawings; in

taken substantially iinthe plane ofthe-.line ,5-7-5 Figure 6v is.accross-sectional view, V*taken "sube4 the line l--Bv infFigstantially,in the `plane cvfure 1;'. j

Figure-'2 is a perspective view of a setting box.

used in association with the device shown in Fig-l ure-3;'..,J-m.. .4,1.

YFigures is. ar'side elevational view: former used inthe invention; v Y'Figure -9.I isra. fragmentary perspective View of. the grading'bladeandtongueshow'n inzl'igure' 8,;-5 Figure'lO' is-ato'pplan view ofthe cuttingdisc. shown in liguremwY Y. .l Figurel 1 -is .aperspectiveview of the i disc vShown in Figures 8 and,10; i.; Figure 12isfa rag'mentaryview of .a;re'inforce .a ment'l suchrasmay be f used inconcrete pipes; generally; .i z w n.; 1 1;

Figure 13 is across-sectional view, takensub'r.; stantially. in theplane of the'line l3.-l3 in Fig.- ure 12; and

vligure .14 is an end viewof a modified-form ofthereiniorcement... l N

aah;

Likeicharacters ofreferenceare ernployedfto` design-ate ylike parts.'in, the specification and throughoutthe several views'. n l

It may beexplaned at this pointV that in thein.-

teres-t vof simplicity .ofdescriptio'n the apparatusv will be dealtwithunder threeseparate headings, each being: devoted to oneiof thesub-assemblies.

.. Plas', FORMINQAND SHAPING MNS rlie pipe vforming:v and shaping meansfare' del-1 signatedgenerally by the reference characterv 2.0i

inafter ...described` A` substantially; Aishaped frame. 2.6 is Weldedorotherwise suitably `secirired at tiwo points Aas, at 28, ..30 to oneendofthe core 22, the center vportion of; this fralile1 being formedintegrally with van externally Vscrewthreaded nipfr,

ple 32, as will be clearly apparent, The yapex portion of the frame 26is formed integrally with a pair of laterally extending, arcuateshoulders;'3- 4Y Whichsupportably engage Vand guidethe inner.Ysurfacesgofthe split edgeportions 35,238 ofthe core 22,; asis bestshown in 'Figures 2 and-.3,

Moreover, arcuatey straps-Ml, 42 are secured to" thel respectivesplitedge ,portions-35, M atthel remaining-endportion of- .the core 22,these, straps serv-ing 'to ,further guide .the4 expanding and con:1*,1'acztir1g-v movements `of the, split edge.i portions and preventingthe entirecore from collapsing A rod 44 sndabiy and rotatably extends tmugh the-nipple and through the frame 26, and after passing through thecore 22,A the lrodg44- carries,l

what maybe calledan inside finisher 46. -This iinisher simply assumesthe forml of lan arcuatev plate of a substantially smaller diameter thanthe core 22, the plate from which the finisher 46 is formed beingequipped with a transverse bar 48 so that it may be connected by meansof a T 50 t the rod 44, as shown in Figure 1.

A hand lever 52 is pivotally mounted on the nipple 32 on which it isretained by means of a suitable nut 54, the lever 52 extending upwardlyfrom thf'rane 2.6,);` and carrying' 'a spring-pressed latch actu'atedibyasuitable control 58. The latchv 56 is removably receivable in asuitable aperture formed in an angulated bracket 60 which" is providedat the apex of the frame26, and it is to be noted that the lever 52 isalso formed with. a plurality of apertures 62 to selectively accommodatethe nipple (32) on forming cores of vari'- ous diameters.

A suitable shaft 64 is rotatably journaled in a equipped with a. pair ofcranks 74 each of which is operatively connected by an adjustablecl'evis assembly V"I6 to a bracket `'|78 .secured to the core edgeportion 38,V as lis best shown vin Figuresfl and 5. t` i It will beapparent. that by virtue of this arrangement, movement of thehandle 68fromy one sidetothe other'will vcause the core 22' to expand or'contract as desired, it being. possible to releasably retain the core ina contracted, partially ex'- panded or fully vexpanded position bysimply inserting suitable'keeper pins in the apertures '|;2k ofthesegment 10, `as. has been alreadyY outlined'.

The formingand shaping'.apparatus` also contemplates the provision ofwhat may be referred to as a settingr box 98, this consisting Aof asubstantially semi-cylindrical plate .92..formed with an opening at theedges of which are provided upstanding flanges 94,196, theseconstituting what mayV be called a' concrete receptacle disposed' at theconvex sidelofY the plate 823, substantially asi" shown. l Y i fSuitable handles 98, |00 are providedfion the. flanges S4, andratransverse partition '|02 )is securedf ihtermediatelthe endsv ofthe-'flanges 86 and c'arri'es'ia vibrator receiving pocket |04.Finally,r a plurality of 'pipe' thicknessdeflfning spacers or lugs |06are securedtothe concave surface at one. end of the plate 92,substantially Vas shownr When thisportion `of' the apparatusis placed inuse, a substantially semi-cylindrical-1y ditch |08 is formed inthegroundand'ispartiallyfilled with concrete, and before-this concreteiillsetsfthe. core 22 is positioned in the. ditch so.that-thelconcreteassumes a1 substantially semi-tubular configuration inthe bottom of thefdit'ch, as-indic'atedlat |f| D in YFigures 1 andG-Y- fThereupon the ditch and the. core 22- are covered' by asubstantiallysemi-tubular. reinforcing. 'mesh' |12 Yhaving out-turnedvvlower- Yedge portionsl as atl H14 (see Figurer-'Glpi and-the show-ni.

but vmay be equipped with downward'extensions embedded inthe lowerVhalf-sections ofy the lpi'pe 4 as indicated at in Figure 6, so as tosubstantially reinforce the longitudinal joints between the upper andlower pipe sections.

Concrete may then be poured into the receptacle defined by the anges 54,96 of the box 80, and a suitable vibrator, such as for example, apneumatic vibrator indicated at ||6, is applied to the pocket l|04 sothat the entire boxhSU is subjectedto ibratib'n and'thconcr't lisftampedand caused *to* gravitat'ei'into thespacebetween the mesh l2 and theconcave surface of the plate -92-,thus constituting a cylindricalcomplement l |8 y of the: pipe being poured.

Assoon as the vibrating and tamping operation is completed, the core 22may be contracted by manipulating the handle 68, whereupon the nisher 46 may be manipulated through the medium of the rod 44 so as to smooth orshape the inside f diameter of the pipe.

nsly, Vby usine ,the standffl20- .on .the

corefmay be supported inacentralized position:-

Tof

It is to be observed that the pipe may be poured ina continuous manner,the core 22 and, the vbox being pulled forward by the lever 52 after asection'of the pipe has been completed so that a next section may bepoured to constitute a continuation of the section; already formed. Thelever 52 iszusedfor pulling the core l22 as well as for swinging thecore from `side toside after itis contracted by thehandleGS preparatoryto the forward pulling thereof. VvThe spacers |06. assure that thedistance of the plate 92 from the mesh l2 remains constant throughout.the continuous pouring'l operatiomwthus maintaining thewall thicknessofthe pipe ati a constant, predetermined dimension. The spacersvl needbe provided 1; only at the'forward-fendof= the plate 92, its rear endportion restng'onzthe outer circumference of thenished pipe, as'i'sfbestshown in Figure V1.

To assure centralizedpositioning of the core 2v2 in, the ditch- |108,`:afSI'l-d; |-255may be provided on the rod 44, 'the upper endg-,of thisstand vbeing equipped with a T |22 which lis -slidableon the rod,V whilethe lower endof the stand hasV secured thereto a plate 24; adapted tovrest o n the bottom; of the ditch.,V The' distance from the bottom sur'face ofi the: plate |^24- tovthie axisl of the rod 44 is equal totheoutsideradifus'; l while the outside radius of the core` 2,2 isgequalto` theA inside radius` of the finished pipe;A ,Accor-dl# red .44, the

in the ditch to` f of the desiredthickness. y

Whenjcores 22ofdifferent diameters arefemr`r ployed, the lever 52 may beused selectively thereass-ure that the wall of Athe pipeis with, thisbei-ne` eiiectee by Asimplyremoving the nut '54 `from the nipple 32.anduthereafter disengaging the lever 5,2 `from the nipple and ltwistingthe lever so that :it becomes'disengaged fromv the handle.. Theapertures 62,A of. course,l facilitate use` of the lever 52T on pores.of different; diamsters',v

as has been already explained.

Dir'cr FRMING MEANS The instant apparatus also contemplates" the'provisioniaof, meansxforiforming: yand shapingA the sem-i;-cylindricalerally by" thea-,reference character |301 and: em-

circular grading blade |32, the ends secured together bym-cans of. 'a.cross member |34.

A :tongue r3.8. 'is secured.; at: one end?` thereof Vto lth'e'f extendsfori-i' center of the cross member |34 and of the vfinished pipe,`

ditclrin'whiclritheipipeiis tcr.- be. poured, this dltch former beingdesignated' gn-.

Wardly and downwardly therefrom, and suitable struts |38, |40 areemployedfor reinforcing the cross member |34 and the blade |32,respectively, to the tongue |36, asis best shown in Figure 9.

It is to be noted that the tongue |36 is disposed in a plane which issubstantially perpendicular to the blade |32, and an upwardly extendinghandle |42 is secured to the tongue |36 at the point of attachment ofthe latter to the cross member |34.

A substantially convexo-concave cutter disc |44 is provided at theconcave side thereof with a suitable socket |46 to movably and separablyreceive the free end portion of the tongue |36, and an upwardly inclinedhandle |48 is secured at its lower end to the socket |46, substantiallyas shown.

When the ditch former is placed in use, a trench is dug in the ground asindicated at |60, whereupon downward pressure is exerted by the handiebar |48 upon the cutter disc |44, causing the latter to smooth any highspots such as may be present in the trench. Moreover, the grading blade|32, after passing through the trench, assures that the trench or ditchis of a true, semi-cylindrical configuration, the handle bar |42 beingused, of course, for guiding the entire former along the ditch, as willbe clearly apparent.

CONCRETE PIPE REINFORCEMENT See Figures 12-14 inclusively While thereinforcement employed in the concrete pipe formed by the device is inthe form of a semi-tubular mesh (||2) the accompanying Figures 12-14,inclusively, illustrate reinforcements such as may be eiectivelyemployed with concrete pipes generally, whether these pipes be of thehorizontal variety disposed in ditches or trenches, or of the upstandingvariety, such as for example, concrete silos.

One form of such reinforcements is illustrated in Figures 12 and 13,being designated generally by the reference character |10.

The reinforcement |10 embodies in its construction inner and outertubular forms |12, |13, respectively, these being disposed inconcentric, mutually spaced relation, as is best shown in Figure 13. Theinner form |12 consists of a tubular core |14 of wire mesh covered onthe inside with metallic lath |15, while the outer form |13 consists ofa tubular c ore |16 covered on the outside with metallic lath |11. Thetwo forms are rigidly secured together by radially extending struts |80,whereupon concrete may .be poured into the annular space |82 between thetwo forms,

being retained therein by the metallic lath |15, |11.

If it is desired to provide a transverse concrete partition in thepoured pipe, a pair of spaced wire mesh panels |84 may be provided inthe inner form |12, these being covered on their outer surfaces withmetallic lath |86 and the space |88 between the panels |84 communicatingwith the space |82 so that after the concrete is poured, the partitionWill become an integral part of the wall of the pipe. Communicationbetween the spaces |88, |82 is achieved by omitting metal lath onportions of the core |14 at the ends of the space |88, as shown inFigure 13. For reinforcing purposes a set of transverse rods may besecured to the lath |86, these rods extending through the space |82 andbeing secured to the 'form |12 as well as the form |13.

The accompanying Figure 14 illustrates a modied form of a concrete pipereinforcement, this being designated generally by the referencecharacter |94 and consisting of a tubular, wire mesh core |96 providedon its inner surface with metal lath |98 and on the outer surfacethereof with a plurality of circumferentially extending reinforcinghoops 200, this embodiment of the invention being employed when it isdesired to pour a concrete pipe around the outer circumference of thereinforcement, as will be clearly apparent.

It is believed that the advantages and use of the invention will beclearly understood from the foregoing disclosure and, accordingly,further description thereof at this point is deemed unnecessary.

While in the foregoing there has been shown and described the preferredembodiments of this invention, it is to be understood that minor changesin the details of construction and arrangement of parts may be resortedto without departing from the spirit and scope of the invention asclaimed.

Having described the invention, what is claimed as new is:

In an apparatus for forming concrete pipe, the combination of a spiltand substantially tubular core, a frame mounted at one end of said core,bearing brackets provided at one split edge portion of the core, arotatable shaft extending through said brackets and through said frame,an actuating handle at one end of said shaft, shoulders provided on saidframe for supporting and guiding split edge portions of the core, acrank on said shaft, and a link operatively connecting said crank to theother split edge portion of the core for expanding and contracting thelatter by manipulation of said handle.

JOHN W. COLVIN.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

